Another cloud free day in Scotland let me catch almost 9 hours of this huge and lively prom. Taken with my home made 90mm modded Coronado PST and DMK21 camera. Software: CdC, Eqmod, DSSR, AutoStakkert!, Wavesharp, DVS, Shotcut and Gimp.

David Wilson on April 8, 2025 @ Inverness, Scotland

https://spaceweathergallery2.com/indiv_upload.php?upload_id=221951

  • danc4498@lemmy.world
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    2 months ago

    Is this the actual image your camera sees? Or is it more like heat sensors visualized, or something like that?

    • GamingChairModel@lemmy.world
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      2 months ago

      “actual image your camera sees” is a term that is hard to define with astrophotography, because it’s kinda hard to define with regular digital photography, too.

      The sensor collects raw data on its pixels, where the amount of radiation that makes it past that pixel’s color filter actually excites the electrons on that particular pixel and gets processed on the image processing chip, where each pixel is assigned a color and it gets added together as larger added pixels in some image.

      So what does a camera “see”? It depends on how the lenses and filters in front of that sensor are set up, and it depends on how susceptible to electrical noise that sensor is, and it depends on the configuration of how long it looks for each frame. Many of these sensors are sensitive to a wide range of light wavelengths, so the filter determines whether any particular pixel sees red, blue, or green light. Some get configured to filter out all but ultraviolet or infrared wavelengths, at which point the camera can “see” what the human eye cannot.

      A long exposure can collect light over a long period of time to show even very faint light, at least in the dark.

      There are all sorts of mechanical tricks at that point. Image stabilization tries to keep the beams of focused light stabilized on the sensor, and may compensate for movement with some offsetting movement, so that the pixel is collecting light from the same direction over the course of its entire exposure. Or, some people want to rotate their camera along with the celestial subject, a star or a planet they’re trying to get a picture of, to compensate for the Earth’s rotation over the long exposure.

      And then there are computational tricks. Just as you might physically move the sensor or lens to compensate for motion, you may just process the incoming sensor data to understand that a particular subject’s light will hit multiple pixels over time, and can get added together in software rather than at the sensor’s own charged pixels.

      So astrophotography is just an extension of normal photography’s use of filtering out the wavelengths you don’t want, and processing the data that hits the sensor. It’s just that there needs to be a lot more thought and configuration of those filters and processing algorithms than the default that sits on a typical phone’s camera app and hardware.

    • jdnewmil@lemmy.ca
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      2 months ago

      Not OP, but solar photography requires super dense filters so like sunglasses alter what you see from “actual” the filters also alter the image from “actual” yet this is what would “actually” be “seen” by the camera. So yes and no depending how you want to interpret “actual”.

      • danc4498@lemmy.world
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        2 months ago

        Thanks, this makes sense. I’ve heard there are some great astronomy photos where what we are seeing isn’t actually visible to the naked eye. Rather it’s invisible gases or something, and the photos are just visualizations based on assigning colors to density… I guess I was wondering if it was something like that. It sounds like it’s not.

        • jdnewmil@lemmy.ca
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          2 months ago

          When they sense invisible electromagnetic wavelengths like xrays or microwaves and “assign” colors to completely invisible wavelengths then that is false color imaging. Possible to do with the sun… but unlikely with an amateur rig.

    • lurker2718@lemmings.world
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      2 months ago

      To add what the others said, this image is most likely taken with a special filter for taking only one specific wavelength, so color. In this case H-alpha, so excited hydrogen atoms, which is deep red. With this and additional filters for safety you can see more or less this image yourself, except it’s red. I already had the opportunity to try this.

      Here is a site showing daily images of the sun taken with different filters. Red is H-alpha, also shown in OP. Only with this filter you can see the protuberances. White is white, so what you would see if you could look directly without burning your eyes, or what you see with eclipse goggles. Right is another special Line, Calcium K. All of this you can look at with the right filters and a telescope and it looks similar to the images here, except the two colors are even more saturated than shown here. However, changes are on the order of minutes, so it looks more like an still image.

      However, the sun and planets are pretty much the only object where images are similar to what you could see with telescope and filters. Colorful images of the moon are always heavily processed. For nebulas and galaxies its even more of a difference, they are just too dark to see more than a grey blob. For this a telescope does not help much, similar to a lens not helping to see in the dark. So nebulas and galaxies are shown at least hat they would look like, if they were brighter. But most of the time they are shown with a lot brighter colors than reality.

  • Sgarcnl@lemmy.world
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    2 months ago

    If the earth to scale is accurate, the drops coming to the surface might be approximately close to the land mass of a large continent.

  • trotfox@lemmy.world
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    2 months ago

    It’s crazy this guy is just doing this on his own. Looks like something from NASA to me.

  • Higgs boson@dubvee.org
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    2 months ago

    Another cloud free day in Scotland let me catch almost 9 hours of this huge and lively prom.

    As soon as I read the word “Scotland”, my brain went back and revised this to be read in Scott Manley’s voice.

  • 1luv8008135@lemmy.world
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    2 months ago

    So dumb question, but what’s causing the gap between the plasma cloud(?) and the surface? And is that gap filled with something that is invisible?

    • crapwittyname@lemm.ee
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      2 months ago

      Plasma is electrically charged, so it interacts with magnetic lines.
      The sun has magnetic field lines just as the earth does. It also rotates. But- since it’s not solid, it doesn’t have to rotate all at the same speed. The plasma in fast-rotating regions drags the field lines further than the plasma in slow rotating areas, creating weird loops, breaks and reconnections in the field lines. I’m almost certain that what we’re seeing in this lovely bit of photography is a cloud of plasma travelling across, or trapped by one of those rogue field lines which has been pushed upwards from the surface by differential rotation.

        • crapwittyname@lemm.ee
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          2 months ago

          Even cooler: solar flares and mass ejections come about when one of the lines snaps like a whip and hurls billions of tonnes of plasma into space. Search: solar magnetic reconnection.

            • crapwittyname@lemm.ee
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              2 months ago

              Yes, the material the streams are made of is magnetic, and there is a strong and unusual magnetic field around the sun. So those streams are trapped by magnetism.

    • niktemadur@lemmy.world
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      2 months ago

      The dynamics there due to sheer gravity, magnetism and levels of energy/radiation that are utterly alien to our daily experience.

        • perestroika@lemm.ee
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          2 months ago

          A guess: doubly ionized helium vs. singly ionized helium. They absorb different amounts of radiation (have different opacity). At high opacity it gathers heat and subsequently expands. At low opacity it lets the heat pass through, subsequently cools and condenses.

          (This is the mechanism that makes Cepheid stars regularly and predictably change intensity. The same mechanism is probably present in other stars too, and causes local processes that we cannot observe from another star system… but can observe in the Sun.)

          Alternatively, there could be a multitude of other effects doing something similar.

          • niktemadur@lemmy.world
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            2 months ago

            This is the mechanism that makes Cepheid stars regularly and predictably change intensity

            Doesn’t it also make the Cepheid noticeably swell (then deflate) in circumference? Or does it maintain the same basic size, and it’s just storing magnetic bubbles of hot plasma like a halo, before bursting and releasing all that accumulated material?

            • perestroika@lemm.ee
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              2 months ago

              To my understanding they do chance circumference. The opaque doubly ionized helium forms at high temperature, expands until temperature drops (change in circumference), drops to singly ionized after expansion, and gets doubly ionized again after contraction (another change in circumference). In Cepheids, it’s uniform across the whole star.

              Thus, your question makes me doubt my original speculation that it’s helium changing ionization levels. The way some material “climbs up” into the arc in this video (from the right end, at one point of time) while other material “rains down” make a magnetic explanation (proposed by others here) seem more plausible.

  • gcheliotis@lemmy.world
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    2 months ago

    Absolutely amazing that you could capture that with “amateur” equipment, although it is clear from your post that a lot went into this. Bravo!

  • stupidcasey@lemmy.world
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    2 months ago

    Look at this and tell me life couldn’t evolve on the Sun, that is a stable structure with reputation patterns, this alone is enough to make Conway’s game of Life

    • meco03211@lemmy.world
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      2 months ago

      Life as we know it could not “evolve” on the sun. And technically life has to be present first before it can evolve. Evolution isn’t what created life. It’s just how the living change over time.

      • trotfox@lemmy.world
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        2 months ago

        A gaseous cloud in space the size of 7 suns may have the ability to flow right past us, but also, think.

      • stupidcasey@lemmy.world
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        2 months ago

        Obviously plasma beings would be nothing like us at least physically (theoretically it could have similar systems like nervous systems)

        And as for life having to exist first, ehh, terms get vague at that point, are the chemicals alive? No, but when they happen to be in a certain state they are, I prefer to think of it like Rocks evolve into a planet, not the same thing as biological evolution but it’s the same word and since the chemicals are the predecessor to life then they did evolve from them in that manner just no genetics involved

        • meco03211@lemmy.world
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          Except you don’t just get to conflate your personal definition of evolution with the scientific one. If you want to believe rocks “evolve” into a planet, that’s fine. But if you start bringing that up without clarifying your definition of evolution and how it factually differs from the scientific one, people will think you’re crazy.

          • stupidcasey@lemmy.world
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            2 months ago

            Except chemicals do literally evolve into life which evolve into DNA, it is a fuzzy point because DNA didn’t exist yet, but it is still natural selection and random chance that leads to the first life form, I am deliberately conflating biological evolution with the more main stream definition because at that point in time biology physics and chemistry were all physically conflated.

            • meco03211@lemmy.world
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              2 months ago

              This is entirely incorrect. Abiogenesis is the mechanism that converts “chemicals” to life. The only thing you are deliberately doing is stating factually incorrect concepts about an intensely deep and developed area of study. The “more mainstream definition” is just wrong.

        • floofloof@lemmy.ca
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          2 months ago

          Sounds like the kind of thing a self-modifying plasma field living inside a nova remnant would say, on the internets.

          • Angry_Autist (he/him)@lemmy.world
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            2 months ago

            No indeed, fellow carbon-having being! I am truly an human, that does many humanish things like laughing and farting, sometimes both at once! akakakakak!

            It is silly to think that anything as beautiful and majestic as a self-modifying EM field could exist, I mean such a being would be perfection right? Basically a glowing radiant god yes? Oh my I truly wish I was a free-flying energyform of psychically controlled vortexes of pure creation, instead of this little crunchy salt water sack that we humans are always being.

            No, I truly love this cold little rocky world where matter can exist in other simpler forms than vibrating and glorious plasma.

    • Angry_Autist (he/him)@lemmy.world
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      They were born in the early days of all things, when even space burned with white hot fire

      They persisted, EM fields feeding their core the kaleidoscope soup of nameless plasma and shattered atom hearts and over strange aeons began to learn to shape the fields that fed and flew them

      In time as the particle sea began to cool, they found refuge in brief stars larger than solar systems, cavorting and chasing in the balmy updrafts so hot that even helium burns

      Now in this cold distant future, where stars are but unreachable cinders, they scrimp and conserve the relatively little time our sun has left to them, some two billion short years hence.

      Pray for our star children, we cannot grasp even a fraction of the cosmic empire they have lost

      • reptar@lemmy.world
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        2 months ago

        we cannot grasp even a fraction of the cosmic empire they have lost

        I just finished the last book in The Expanse. This really made me think of the gate builders

        E: I should have also said, loved your post!

        • Angry_Autist (he/him)@lemmy.world
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          2 months ago

          Thank you, it’s been a really low week and knowing you liked my post has been healing for me these two days.

          Not enough people engage on lemmy yet and I wanted to be sure you knew that your comment meant a lot to me. I love to write but rarely get any feedback on it.